Central Processing

Central Processing
As you approach the door at the end of the hall, an imp will spawn in the small room to the left and, almost simultaneously, another will appear behind you. In the room to the left you'll find a locker that can be opened with the code 571. Open up the door inside this small room and you'll immediately run into a wraith. Take it out.

The next open hall branches in multiple directions. The door to the room directly in front of you is locked, so for now turn left and head into the first office door. You'll find the PDA of Tony Bates, and an imp will spawn behind you as you grab it. The next office room down the hall has a bunch of ammo to grab. Stock up, then exit the office and follow the hallway left.

As you round the final corner, get your soulcube ready to take down the archvile that spawns directly in front of you. You'll need the code 627 to open the door to Lab A. Head down the hall to the right and jump across the panels to reach the door that leads to Lab A Lower Floor. As you go down the first hall and past an elevator, watch for the cherubs that come from the left.

Further into the lower floor of Lab A you'll come across a wraith as an imp spawns behind you. There's also a small trap at the cusp of the hallway—if you grab the armor shard on the ground, the wall will give way revealing an imp and a bit more armor. At the end of the hall is a large control area, and tons of ammo to the right. Stock up, but be ready to shoot down the pair of cherubs and the single wraith that spawn behind you as you do. Also be sure to grab the PDA of Charlie Haskell.

You can exit the door to the right to jump on some floating platforms and grab some extra ammo. Just be prepared for the imp and commando zombie that have now spawned back in the lower level of the lab. Backtrack down the hall a bit to the elevator, shoot down the pair of cherubs, and then ride the elevator to the second floor of Lab A. A wraith will meet you at the top of the elevator and, as you round the first right-hand corner, you'll find another archvile to deal with. You should have your soulcube powered up by now, so go ahead and use it.

Further down the hall of the second floor of Lab A are two wraiths and an elevator that leads to the third floor. You'll have to deal with a bunch of cherubs as you step out of the elevator on the third floor, and there's a commando zombie that you'll run into as you move down the back hall. Head through the doorway at the end of the hall and watch out for the pair of imps that spawn on either side of you as you make your way down the next hall.

There's some ammo and armor in the area to the right, and as you collect it you'll be faced with more imps and cherubs. Continue down the hall and through the next door. Around the corner is an imp in the dark. You can open the nearby storage locker with the code 468. Just right of the locker is the inventory item you need, though as you grab it you'll be swarmed by trites as an imp spawns in front of you. Quickly grab the item and then retreat down the previous hallway to funnel the enemies towards you.

Backtrack towards the elevator, but watch for the commando zombie on the other side of the first door. There'll be cherubs in the Lab A Upper Floor Offices, but nothing else to worry about until you reach the elevator. Ride the elevator to the second floor and clear the area of wraiths—there are a bunch of wraiths, and your best bet is to hang out inside the elevator and let them warp to you. Clear the way to the next elevator and ride it down to the first floor of Lab A.

When you reach the first floor, turn left to exit the lab and backtrack to the Main Entrance Hall. You'll have to clear out some trites from down the hall, along with an imp further in. You can use the new inventory item to unlock the doorway along the left wall, or you can head through the doorway on the far end of the hall to get some ammo and health pickups. Either way, unlock the door in the Main Entrance Hall and follow the hall to the Elevator Access Hall. Step into the elevator to exit the level.